Maybe the question from the topic is not clear enough. I was migrating a library in our app which brought quite a few braking changes. The compiler emitted a few hundreds or errors which I had manually to fix. I did that, but for some reason the compiler seemed (or static analyser? - how is this called correctly?) to remember those errors even after they were resolved and syntax highlighting partly confirmed it. I tried clearing the build and deleting everything from
DerivedData but nothing helped. The last resort was to manually delete those affected lines and re-add them so the errors finally did go away.
So my question is, does the compiler or any related system caches the errors at some point and is there a better way to force clear those to re-analyse the code than deleting and re-adding everything?
I was using Xcode 9.4.